How to use UART RK3588 - Revision history

Zhihao.zhu: /* AOM-3821 Borad */

2025-04-28T05:38:28Z

‎AOM-3821 Borad

Zhihao.zhu at 01:07, 27 April 2025

2025-04-27T01:07:55Z

Bo.xiao at 05:29, 15 April 2025

2025-04-15T05:29:42Z

Bo.xiao at 05:27, 15 April 2025

2025-04-15T05:27:10Z

Bo.xiao at 07:15, 21 March 2025

2025-03-21T07:15:04Z

Bo.xiao at 07:13, 21 March 2025

2025-03-21T07:13:29Z

Bo.xiao: /* Boards */

2025-03-21T06:44:34Z

‎Boards

Yunjin.jiang: Created page with " = '''Overview''' = The Android/Linux UART/serial port access from user is through the tty-devices. The tty-devices have different names depending on UA..."

2023-06-13T02:24:23Z

Created page with " = '''Overview''' = The Android/Linux UART/serial port access from user is through the tty-devices. The tty-devices have different names depending on UA..."

New page

= '''Overview''' =

The Android/Linux UART/serial port access from user is through the tty-devices. The tty-devices have different names depending on UART driver on different board.

== RS-485 ==

RS-485 uses half-duplex communication, which means that one medium is shared for transmitting and receiving data.

Therefore the system needs to control the RS-485 transceiver's transmit mode.

Usually the UART RTS signal is used to switch the transmitter on and off.

= '''Boards''' =

== ROM-6881 Borad ==

{| border="1" cellpadding="1" cellspacing="1"
|-
| '''COM Name'''
| '''Device Node'''
| '''Remark'''
|-
| COM1
| /dev/ttyS0
| RS232 2-wire
|-
| COM2
| /dev/ttyS6
| RS232 4-wire
|-
| COM3
| /dev/ttyS9
| RS232 4-wire
|}

'''Note : '''

 

= How to config RS232 or RS485 mode =

Enter U-boot interrupt mode

Connect device to debug port, and open debug console. See more : [http://ess-wiki.advantech.com.tw/view/How_to_debug_RK3568 How_to_debug].

Press "ctrl + c" key before power up the device, until get the following information on debug console : 
<pre>Hit any key to stop autoboot: 0
=> <INTERRUPT>
=></pre>

Then you can input the following cammand to config UART mode.

== Config Uart Mode ==

Only ttyUSB2 and ttyUSB3 support RS485 mode.

'''RS485 Mode: '''
<pre>setenv uart_mode 0x0c
saveenv
reset
</pre>

'''RS232 Mode: '''
<pre>setenv uart_mode 0x00
saveenv
reset
</pre>

'''Note : '''

The default value is RS232. 

Cp210x support four port, but RSB4810 Only ttyUSB2 and ttyUSB3 support RS485 mode.

Above command "setenv uart_mode 0x0c", 0x0c means set bit2(ttyUSB2) and bit3(ttyUSB3) to 1 (0 means to RS232; 1 means to RS485).

If you just want ttyUSB2 (or ttyUSB3)to be RS485 mode, please change 0x0c to 0x04 (or 0x08).

← Older revision		Revision as of 05:29, 15 April 2025
Line 67:		Line 67:

	2. The COM1 and COM3 default mode is RS232 4-wire.		2. The COM1 and COM3 default mode is RS232 4-wire.
		+

@@ Line 47: / Line 47: @@
 |-
 | COM1
-| /dev/ttyS5
+| /dev/ttyS6
 | RS232 4-wire or RS485
 |-
 | COM2
-| /dev/ttyS6
+| /dev/ttyS5
 | RS485
 |-
@@ Line 66: / Line 66: @@
 . Only COM1 and COM3 support RS232 4-wire.
 &nbsp;

@@ Line 119: / Line 119: @@
 If you just want ttyS6(or ttyS9)to be RS485 mode, please change "6:1,9:1"to "6:1,9:0"(or "6:0,9:1").
-== Config Uart Mode ==
+== Config Uart coming from cp2108 ==
 '''RS485 Mode:&nbsp;'''

@@ Line 96: / Line 96: @@
 Then you can&nbsp;input the following cammand to config UART mode.
 == Config Uart Mode ==
 '''RS485 Mode:&nbsp;'''
@@ Line 114: / Line 134: @@
 '''Note&nbsp;:&nbsp;'''
 Above command "setenv uart_mode 0x0c", 0x0c means set bit2(ttyUSB2) and bit3(ttyUSB3) to 1 (0 means to RS232; 1 means to RS485).
 If you just want ttyUSB2 (or ttyUSB3)to be RS485 mode, please change 0x0c to 0x04 (or 0x08).

@@ Line 88: / Line 88: @@
 &nbsp;
 == AOM-3821&nbsp;Borad ==
@@ Line 100: / Line 101: @@
 | /dev/ttyS0
 | RS232 2-wire
 |}

@@ Line 38: / Line 38: @@
 &nbsp;
 == ASR-A501&nbsp;Borad ==
 '''Main Board'''
 {| border="1" cellpadding="1" cellspacing="1"
 |-
@@ Line 63: / Line 66: @@
 |}
-'''Note&nbsp;:&nbsp;'''
+'''Note&nbsp;:&nbsp;''' 1. Only COM1 and COM3 support RS232 4-wire.
 . The COM1 and COM3 default mode is RS232 4-wire.
@@ Line 82: / Line 84: @@
 | RS232 2-wire
 |}
 '''Note&nbsp;:&nbsp;'''

← Older revision		Revision as of 06:44, 21 March 2025
Line 35:		Line 35:
	\|}		\|}

		+	'''Note : '''
		+
		+
		+	== ASR-A501 Borad ==
		+	'''Main Board'''
		+	{\| border="1" cellpadding="1" cellspacing="1"
		+	\|-
		+	\| '''COM Name'''
		+	\| '''Device Node'''
		+	\| '''Remark'''
		+	\|-
		+	\| COM1
		+	\| /dev/ttyS5
		+	\| RS232 4-wire or RS485
		+	\|-
		+	\| COM2
		+	\| /dev/ttyS6
		+	\| RS485
		+	\|-
		+	\| COM3
		+	\| /dev/ttyS9
		+	\| RS232 4-wire or RS485
		+	\|-
		+	\| COM4
		+	\| /dev/ttyS3
		+	\| RS485
		+	\|}
		+
		+	'''Note : '''
		+	1. Only COM1 and COM3 support RS232 4-wire.
		+
		+
		+
		+	'''EG90/RM01/RM02'''
		+
		+	{\| border="1" cellpadding="1" cellspacing="1"
		+	\|-
		+	\| '''COM Name'''
		+	\| '''Device Node'''
		+	\| '''Remark'''
		+	\|-
		+	\| COM1
		+	\| /dev/ttyS7
		+	\| RS232 2-wire
		+	\|}
	'''Note : '''		'''Note : '''